Methane gas geomembrane permeability

April 1st, 2022

Q: What is the least permeable geomembrane to methane gas? Regarding the permeability of geomembranes to methane gas, could you send me some technical guidelines? A: High-density polyethylene (HDPE) geomembranes are denser (more crystalline) than linear low-density polyethylene (LLDPE) geomembranes and less permeable. The water vapor, solvent and methane transmission (diffusion) of an HDPE barrier […]

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Scratch impact on HDPE liners

April 1st, 2022

Q: I have a project where multiple and extensive scratches were created on the high-density polyethylene (HDPE) liner for a reservoir due to poor construction practices. (See the following Figures 2–4.) FIGURE 2 Construction equipment that caused scratches at crest of slope FIGURE 3 Overview of scratches in 60-mil (1.5-mm) high-density polyethylene (HDPE) conductive liner […]

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GSI on-demand online course details designing with geosynthetics

October 2nd, 2018

The Geosynthetic Institute (GSI) is offering an on-demand online course entitled “Designing with Geosynthetics,” based on the book of the same title by Robert M. Koerner. Dr. Koerner, professor emeritus of civil engineering at Drexel University and director emeritus of GSI, teaches the course. All Geosynthetic Materials Association (GMA) member companies and their employees will receive […]

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Geosynthetics and coal combustion residuals

October 1st, 2018

According to the World Bank Group, in 2015 coal produced 41% of the world’s energy and about 34% of the energy production in the United States. While global warming and pollution are serious challenges according to most scientific evidence, and coal burning is cited as one cause of both, there are many staunch advocates of […]

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Construction inspection of MSE walls, berms and slopes is focus of GSI online course

September 27th, 2018

The Geosynthetic Institute (GSI) will host an online short course entitled “Course 2: Construction Inspection of Mechanically Stabilized Earth (MSE) Walls, Berms and Slopes,” Nov. 6–8, from 11 a.m. to 12:30 p.m. and from 2 p.m. to 3:30 p.m. EDT each day. Robert M. Koerner and George Koerner will teach the course. All Geosynthetic Materials […]

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Barry R. Christopher honored with 2018 Koerner award and lecture series

September 11th, 2018

The Geosynthetic Materials Association (GMA), led by a Koerner awardee selection task force, selected Barry R. Christopher, Ph.D., P.E., as the recipient of the 2018 Dr. Robert M. Koerner Award and Lecture Series. The award and lecture series is named for Dr. Robert M. Koerner, Ph.D., the founder and director emeritus of the Geosynthetic Institute […]

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GMA on Wisconsin, waste containment and Lobby Day

August 1st, 2018

April and May were very active months for the Geosynthetic Materials Association (GMA). Our membership coordinated an educational opportunity in the state of New York, made a lobbying trip to Wisconsin and supported Infrastructure Week by advocating for geosynthetics in the nation’s capitol. GMA heads to Wisconsin On Apr. 9, 2018, members of the GMA […]

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Don’t be afraid of making horizontal geomembrane seams on side slopes

August 1st, 2018

Over the years, there have been many discussions raising concerns about having geomembrane field seams located horizontally on side slopes. By not allowing such seams, it usually results in many short roll lengths that become either unused or difficult to tailor into the flat area of the project. Stated differently, the installation costs increase accordingly. […]

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QA/QC for geosynthetics in waste containment is focus of GSI course

June 26th, 2018

The Geosynthetic Institute (GSI) will host an online course entitled “Course 1: Quality Assurance/Quality Control of Geosynthetics in Waste Containment Facilities,” Oct. 16–18, 2018, from 11 a.m. to 12:30 p.m. and from 2 p.m. to 3:30 p.m. EDT each day. Robert M. Koerner and George Koerner will teach the course. This is the first GSI […]

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GSI offers online course on QA/QC of geosynthetics in waste containment

December 12th, 2017

The Geosynthetic Institute (GSI) will offer an online course entitled “Quality Assurance/Quality Control of Geosynthetics in Waste Containment Facilities,” on Jan. 30 and 31, 2018, and Feb. 1, 2018, from 11:00 a.m. to 12:30 p.m. and from 2:00 p.m. to 3:30 p.m. EST. This online course focuses on the quality assurance/quality control (QA/QC) of geosynthetics […]

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